Trolley-head.



No. 733,727. PATENTBD JULY 14, 1903. 7

F. V. MARSH.

TROLLEY HEAD.

APPLICATION FILED we. 22, 1902.

1T0 MODEL.

[(fiinesaea: J7 ZV67ZZUr;

' head and ends of the shaft.

Patented Jul 14, 1903.

PATENT OFFICE.

FREDERICK V. MARSH, OF HAVER-HILL, MASSACHUSETTS.

TROLLEY-HEAD.

SE'EGIFIGA'IION forming part of Letters Patent N 0. 733,727, dated July 14, 1903.

Application filed August 22, 1902. Serial No. 120,627. (lilo model.)

To aZZ whom it mag concern.-

Be it known that I, FREDERICK V. MAnsH, of Haverhill, countyof Essex, State of Massachusetts, have invented an Improvement in Trolley-Heads, of which the following description, in connection with the accompanying drawings, is aspecification, like characters on the drawings representing like parts.

In the forms of trolley-heads now in general use the bearing-shaft of the trolley-wheel is held in place by means of cotter-pins, which pass through holes bored in thearms of the While comparativelylittle difficulty arises from having these pins come out, so that the shaft will become loosened and drop out of the trolley-head, yet much inconvenience and expense are often occasioned by these pins becoming so firmly secured to the arms of the trolley-head by rust that it is very difficult to remove them. Moreover, in attempting to place the trolleywheel upon the wire it often happens that the arms of the head or the ends of the cotterpins will be brought in contact with the trolley-wire, causing the formation of an are, which often firmly welds the pins to the arms, thereby rendering the removal of the pins extremely difficult. WVhen the trolley-shaft is held in place by cotter-pins, it is considered desirable to have its ends protrude beyond the sides of the arms, and these ends often engage the trolley-wire, with the result-that the shaft becomes so firmly welded to the head that it is often less expensive to buy a new head than to remove the shaft.

The object of my invention is to provide a form of trolley-head which enables the shaft of the trolley-wheel to be connected to the arms of the head in such a manner thatthe shaft may be readily removed under practically all conditions and in which the use of cotter-pins is avoided. I accomplish this object by dividing the trolley-head longitudinally into two sections, so that the two arms thereof may be separated to permit both ends of the wheel-shaft to be screwed into said arms, the sections being securedtogether in the base portion of the head in a novel manner, which gives as great rigidity to the connected parts as if they were integral.

Foran understanding of my invention reference is made to the accompanying drawings, in which Figure 1 is a front elevation of my improved trolley-head,partly in section. Fig. 2 is a side between them extending longitudinally of the base portion and terminating in a shouldern on section a. The section a has the stem 0 cast integral therewith, said stem being adapted to be connected to the trolley-pole in the ordinary manner. spectively provided with, arms (Z and e, and said arms have holes (1 and e at their upper ends, which are screw-threaded to receive the correspondingly-threaded ends of the shaft f of the trolley-wheel h. are preferably both right-hand threads. Said sections a and b are formed with fiat meeting faces a I), which, when the parts are assembled, are preferably in a plane at right angles to the shaft f and slightly to one side of the middle point thereof, so that the base portion of the section a, which is cast integral with the stem 0, is somewhat stronger than the other section, b. The sections are clamped together by means of the bolt 2', which passes through their base portions perpendicular to their meeting faces, said bolt being held from turning by a lug b and fastened in place by a nut 7t. W hen the sections are thus secured,

the arms d 6 thereof will be parallel and equidistant from the center line of the trolley-pole.

The section a is provided with a curved rib Z, the center of the arc on which it is formed beingat the axis of the shaft The section Z) is provided with a correspondingly-curved o groove 172, into which the rib Z may fit. The face of the shoulder a on section a is also formed on a curve from the same center, as is also the face of the lower end of the section b, which closely engages the face of said shoul- 5 der when the parts are assembled.

To assemble the parts, the shaft f is first screwed into the arm (Z and then the wheel 72 is placed thereon. The arm of section b is The sections a and b are re- 65 These screw-threads 7o arms and on the shaft being so formed that the two faces a and b will come closely together when the holes for the bolti come into register. The bolt 1 is then inserted and the nut tightened, firmly securing the sections together. As the meeting faces of the two sections are swung into engagement the rib Z of one section tightly fits into the groove m of the other section and holds section b from turning on bolt 1', making the connection between the two sections very rigid and avoiding the necessity of using two bolts instead of one, which would be objectionable. The rigidity of the connection is also materially increased by forming the curved end of the section b so that it will fit closely against the correspondingly-shaped face of the shoulder 11 and the section b is thus held from turning on bolt i at each side of said bolt.

Then it is desired to remove the trolleywheel,it is simply necessary to remove the bolt i and swing the section b about the shaft f, as shown in Fig. 2, until it is unscrewed there from. The length of section b is such that a leverage of considerable length is secured, so that in case both of the arms (1 6 should have become more or less firmly connected to the shaft f by means of rust or other causes either one end or the other of the shaft may be readily unscrewed from its corresponding arm. After either end of the shaft f is unscrewed from its arm the worn trolley-wheel may easily be removed and a new one placed on the shaft, after which the parts may be screwed and bolted together, as before described.

By having a threaded connection between the ends of the shaft and each arm the shaft would not become disconnected from either arm, even if the bolt 2' should drop out, as the section I) would simply swing downwardly and hang in a vertical position by reason of its weight, and the rotation of the wheel would tend to turn the shaft into the arm (Z. However, there is practically little liability of the bolt becoming loosened, as the rib land shoulder n prevent the two sections from working on each other to such an extent that there is but little strain on the bolt.

Aside from the advantages possessed by my construction, by reason of the readiness with which the trolley-wheel may be removed and replaced, my device possesses other advantages in that the ends of the shaft may be cut off so that it will not project beyond the sides of the arms, whereby all possibility of its coming into contact with the trolleywire is avoided. As the projecting cotter-pins east, and practical use has shown that it is much more durable than the old form.

By the word longitudinally as used in the claims in connection with. the direction in which the meeting faces a b of the sections extend I do not intend to limit myself to a direction which is exactly parallel with the center line of the stem 0, as it will be apparent that good results may be secured if the faces a Z) extended obliquely to said center line.

Other minor changes may be made in the construction herein described without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Let ters Patent, is

1. A trolley-head comprising a base portion adapted to be connected to the pole at its lower end, two arms, a shaft, means for securing one end thereof in one of said arms, and a screw-thread connection between the other end of said shaft and the other arm, one of said arms being formed integral with said base portion, and means for connecting the other arm thereto above the pole connection, said arms being provided with flat meeting faces which are in planes substantially perpendicular to the axial line of the shaft, said means permitting the connected arm to be rotated about said axial line asa center while said faces are substantially in engagement, and while the other arm is connected to the pole, substantially as described.

2. A trolley-head comprising a base portion divided longitudinally into two sections having correspondingly-formed meeting faces, an arm formed with each section, a shaft having its ends held by said arms, means for clamping said faces together, and a transverselyextending projection on one section having a face which is located at a suitable distance from it, and is curved on an are having as its center the axial line of said shaft, the other section having a face which is correspondingly located and curved, whereby said faces will be brought into engagement when said parts are assembled, substantially as described.

3. A trolley-head comprising a base portion divided into two sections having correspondingly-formed longitudinally-extending meeting faces, an arm formed integrally with each section, a wheel-shaft having a screw-thread connection with each of said arms, and means for clamping said sections together at their base portions comprising a bolt which passes transversely through said sections, substantially as described.

4. A trolley-head comprising a base portion divided longitudinally into two sections having correspondingly-formed meeting faces, an arm formed integrally with each section, a shaft having its ends held by said arms, a transverse] y-extendin g bolt for clamping said sections together, a transversely-extending projection on one section having a face which is curved on an arc having as its center the center of said shaft, and a correspondinglycurved face on the other section adapted to engage the curved face of said projection, substantially as described.

5. A trolley-head having a base portion divided into two sections having longitudinallyextending meeting faces, an arm formed integrally with each section, a wheel-shaft havin g a screw-thread connection at each end with said arms, a transversely-extending bolt which passes through the base portion of said sections, a rib on the face of one section which is curved on an are having as its center the center of said shaft, the other section having a groove curved on the same are and adapted to receive said rib, substantially as described.

6. A trolley-head having a base portion divided into two sections having longitudinallyextending meeting faces, an arm formed integrally with each section, a wheel-shaft hav-' ing a screw-thread connection at each end with said arms, a transversely-extending bolt which passes through the base portion of said sections, a transversely-extending shoulder at the end of the meeting face of one of said sections having a face which is curved on an are having as its center the center of said shaft, the other section having its base end correspondingly curved and adapted to engage the face of said shoulder, substantially as described.

7. A trolley-head having a base portion divided into two sectionshaving longitudinally extending meeting faces, an arm formed integrally with each section, a wheel-shaft having a screw-thread connection at each end with said arms, a transversely-extendin g bolt which passes through the base portion of said sections, engaging faces on said sections at opposite sides of said bolt which are curved on arcs having as their center the center of said shaft, substantially as described.

8. A trolley-head having a base portion di- FREDERICK V. MARSH.

Witnesses:

LoUIs H. HARRIMAN, FRANK E. BLACKBURN. 

